Azobisisobutyronitrile → Methyl 7-chloro-3-methyl-2-oxo-2,3-dihydro-1H-benzimidazole-4-carboxylate

Participants

Reaction Steps

A solution of methyl 3-methyl-2-oxo-2,3-dihydro-1H-benzimidazole-4-carboxylate (500 mg, 2.42 mmol), N-chlorosuccinimide (355 mg, 2.66 mmol) and 2,2′-azobis(isobutyronitrile) (20 mg, 0.12 mmol) in carbon tetrachloride (40 mL) was refluxed for 2 days. After cooling, the reaction mixture was concentrated in vacuo. The resultant was extracted with ethyl acetate and water. The organics was dried over magnesium sulfate, filtered, and concentrated in vacuo. The residue was chromatographed on a silica gel to give 167 mg (0.07 mmol, 29%) of the title compound.

Provenance & Evidence